July 31, 2016 4:16 PM EDT

Bernie Sanders on Sunday pinned his stoic expression during Hillary Clinton’s speech at the Democratic National Convention on the fact that he’s “not always a smiley kind of guy.”

The Vermont senator was mocked on social media after Clinton, his former challenger for the Democratic nomination for president, praised him as she delivered her acceptance speech last week.

Sanders was near emotionless as Clinton thanked him early on in her speech, saying his campaign “inspired millions of Americans” and “put economic and social justice issues front and center where they belong.”

When he was asked Sunday on CBS’ Face the Nation whether his facial expression during Clinton’s speech indicated his displeasure with the race’s outcome, Sanders replied, “I always have that look on my face. It’s nothing new. I’m not always a smiley kind of guy.”

He added the Democratic convention was “a very good convention” and that Clinton addressed some “very, very important points” in her speech.

“In these stressful times we’ve got to bring our people together, not divide us up, which is what Trump is trying to do,” Sanders said.

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